Can anyone comment on any appreciable differences? Trijicon has two different diameter optics which is interesting, and it seems like Mepro has a wider variety of reticules. Any other big differences in say, construction, durability, optics coatings, optics clarity, something else I haven't thought of?

It'll be going on a CQB type weapon though I have yet to determine exactly which. AR or Springer Scout/Socom or PTR-91.